Hi so I'm currently building a 3inch boka and just wondering what's a good size for the output tube before I go and buy the needle valve.1/4 inch 1/2 inch or 3/8 inch? Thanks
equipment: 2" pot with 2" shotty 400mm long 5x 1/2" on a t500 boiler. 50l keg boiler 4" still mount 4" sight glass 1" drain.. 4 plate 4" bubbler, 600mm packed section